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Determination of Residual Stresses by Instrumented Indentation

Kashani, Amir Hoseain | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40580 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farrahi, Gholam Hossein
  7. Abstract:
  8. Residual stresses are one of the influencing factors on fatigue life. These stresses may cause cracking and failure of the element even in the absence of any applied stress or any external load. For this reason they are very important, and their measurement is crucial. The methods for measuring the residual stress in spite of their name often measure the strain and by analyzing the measured strain, determine the residue stress of the element. The important problem about residual stresses is that their values in the element often remain unknown and usually no simple and non destructive method for measuring is available. Usually finite element analyzing is used for modeling the production processes which is basically more difficult. The main method considered in the present research, is to determine residual stresses by instrumented indentation. In this method by measuring the hardness, using the finite element analysis and analyzing the data we can measure residual stresses. In comparison with usual technique, this technique is a rapid, simple and effective method for measuring the residual stresses, however its accuracy might be less than more expensive and time consuming methods. In this project pyramid indenter of vickers indentation testing is used. In the process of finite element solving, the following steps follow. First using the heat flux, residual stress is introduced in the element. Then the next step is vicker's indentation analysis with standard loads is applied. The finite element analysis, data processing results, comparisons, finally an analytic-experimental relation between "hardness - residual stress" is given.

  9. Keywords:
  10. Residual Stress ; Finite Element Analysis ; Hardness Testing ; Indentation

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